Calculate two iterations of Newton's Method to approximate a zero of the function using the given initial guess. (Round you answers to four decimal places.) f(x) = cos x, X = 0.5 f(xn) f(xn) n Xn f(xn) f'(xn) Xn f'(xn) f'(xn) 1 0.4794 1.830 2.330 2 -0.6886 0.72504 0.950 3.280